Function cloneSignature

test/fixtures/snapshot/typescript.js:57972–57980

(sig)

            return sig;
        }
        function cloneSignature(sig) {
            var result = createSignature(sig.declaration, sig.typeParameters, sig.thisParameter, sig.parameters, /*resolvedReturnType*/ undefined, 
            /*resolvedTypePredicate*/ undefined, sig.minArgumentCount, sig.flags & 39 /* SignatureFlags.PropagatingFlags */);
            result.target = sig.target;
            result.mapper = sig.mapper;
            result.compositeSignatures = sig.compositeSignatures;
            result.compositeKind = sig.compositeKind;
            return result;
        }
        function createUnionSignature(signature, unionSignatures) {
            var result = cloneSignature(signature);
            result.compositeSignatures = unionSignatures;